This bulletin applies to 2025 Chevy Blazer EV, BrightDrop 400, BrightDrop 600, 2024 Equinox EV and Silverado EV vehicles.  Some customers may comment that a noise can be heard when the vehicle is in motion. The condition may be caused by an internal concern with the gearbox. If a drive unit is found to be making an abnormal noise, replace only the gearbox. The drive unit consists of a drive motor control module (DMCM/TPIM) and gearbox. The replacement gearbox is pre-filled for servicing.